<template>
  <div>
      <h1>{{ageTotal}}</h1>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: [
        {
          name: "小明",
          age: 18,
        },
        {
          name: "小花",
          age: 25,
        },
        {
          name: "小爱",
          age: 21,
        },
      ],
    };
  },
  computed: {
      ageTotal(){
          return this.arr.reduce((sum,obj)=>{
            return  sum+=obj.age
          },0)
      }
  }
};
</script>

<style>
</style>